2.11BSD#431 - /usr/man/cat3/strtoul.0

STRTOUL(3)	    UNIX Programmer's Manual	       STRTOUL(3)


NAME
     strtoul - convert a string to an unsigned long

SYNOPSIS
     #include <stdlib.h>
     #include <limits.h>

     unsigned long
     strtoul(nptr, endptr, base)
     char *nptr;
     char **endptr;
     int base;

DESCRIPTION
     The strtoul() function converts the string in nptr to an
     unsigned long value.  The conversion is done according to
     the given base, which must be between 2 and 36 inclusive, or
     be the special value 0.

     The string may begin with an arbitrary amount of white space
     (as determined by isspace(3)) followed by a single optional
     `+' or `-' sign.  If base is zero or 16, the string may then
     include a `0x' prefix, and the number will be read in base
     16; otherwise, a zero base is taken as 10 (decimal) unless
     the next character is `0', in which case it is taken as 8
     (octal).

     The remainder of the string is converted to an unsigned long
     value in the obvious manner, stopping at the end of the
     string or at the first character that does not produce a
     valid digit in the given base.  (In bases above 10, the
     letter `A' in either upper or lower case represents 10, `B'
     represents 11, and so forth, with `Z' representing 35.)

     If endptr is non nil, strtoul() stores the address of the
     first invalid character in *endptr . If there were no digits
     at all, however, strtoul() stores the original value of nptr
     in *endptr . (Thus, if *nptr is not `\0' but **endptr is
     `\0' on return, the entire string was valid.)

RETURN VALUES
     The strtoul() function returns either the result of the
     conversion or, if there was a leading minus sign, the nega-
     tion of the result of the conversion, unless the original
     (non-negated) value would overflow; in the latter case,
     strtoul() returns ULONG_MAX and sets the global variable
     errno to ERANGE .

ERRORS
     [ERANGE]	    The given string was out of range; the value
		    converted has been clamped.


Printed 11/26/99	January 12, 1996			1


STRTOUL(3)	    UNIX Programmer's Manual	       STRTOUL(3)


SEE ALSO
     strtol(3)

STANDARDS
     The strtoul() function conforms to ANSI C X3.159-1989
     (``ANSI C'').

BUGS
     Ignores the current locale.


Printed 11/26/99	January 12, 1996			2